Temperature compensator for clocks



Oct. 6, 1925- 1,5 6,553

R. A. WOODWARD TEMPERATURE COMPENSATOR FOR CLOCKS Filed Dec. 11, 1924FIG. I

FIG. 2

INVENTOR.

ISM/lard A. Woodward B A TTORNEY.

Patented Oct. 6, 1925.

RICHARD A. WOODWARD, OF GENESEO, KANSAS.

TEMPERATURE COMPENSATOR FOR CLOCKS.

Application filed December 11, 1924.

To all whom it may concern:

Be it known that I, RICHARD A. WARD, a citizen of the United State std.-ing in Geneseo, county of Rice, and irltate of Kansas, have invented newand useful Improvements in a Temperature Comp tor for Clocks, of whichthe lfollowin specification.

My invention relates to a to... compensator for clocks, and the chic. V.my invention are as follows;

First. To produce a temperature coir: pensator, which is inexpensive andeasy to manufacture Second. To provide a ten'iperaiurc c: pensator whichis easy to install in cloci: mechanisms at the factory.

Third. To provide a temperature cont pensator which can be easily andreadily installed in clocks which have already been manufactured withouta temperature conipensator.

Fourth. To provide a temperat pensator which is effective and :IC'L, itsoperations.

Referring to the drawings; Fig. i a View looking in at the back of theclock showing my temperature co; mounted in place, on the mow of theclock. temperature compensator. Fig looking down on the top of intempo-ire ture compensator.

1 is the movement plate, l mounted a steel shaft 2, wh'...v is lil placeby two screws, 3 and The upper end of the shaft 2 is bent outwardly a 5and slotted at the end 13 to for e a g for the feather spring l. Tmmedimafter the shaft 2 is tr. it is swelled as shown at 6 and a hole idrilled through the swelled portion to receive a shaft 9 which will bedescribed later. The lower end of shaft 2 is bent outwardly at the point7 to form a foot 8, through which is drilled a hole, the upper part fwhich is countersunk. A brass shaft 3 is slipped through the hole in theenlarged portion 6 and extends to the foot 8 where it seats in thecountersunk hole, with a threat ed end portion of the shaft 9 continuingthrough the foot 8 and is fitted with a nut 10 which holds the shaft 9rigid with the foot 8. The upper end of the shaft 9 is bent outwardly atthe point 11 being slotted at 12 to form the pendulum support. The

whirl he K Serial No. 755,244.

feather spring 4 is suspended from the pin it; of the pendulum support12, and hangs in position in the pendulum guide 13. The lower end of thefeather spring 4 supports the pendulum rod 1% and pendulum 15. the sameas in ordinary construction. i

'lhe shafts 2 and 9 are made of materials whose co-efficients ofexpansion are unequal. Steel and brass mentioned in this specificationare merely used for examples. lily perature compensator operates asfollows Assuming that the shaft 2, feather sprii g 1 and pendulum rod14: are made of steel, and the shaft 9 is made of brass, the lowingaction would take place under a ng temperature. The feather spring a andpendulum rod 14 would increase in length, which. would tend to cause theclock to lose time, but the shaft 9, being made of brass, would expandor lengthen more than the shaft 2, thereby raising the point which wouldslide the feather spring .L\) up through the feather spring guide, thereby nniintaining the proper length of the pendulum which insures theclock operating with no gain or loss of time. With a fallingtemperatin-e, this is reversedlt will be noted that this temperaturecompensator is held in place with only two scre vs 3 and 3', which makesit possible to install this temperature compensator on clocks which haveno temperature compensator, with very little trouble. It is onlynecessary to drill two holes in the n'lovement plate to receive the twoscrews 3 and 3.

Owing to the simplicity of construction and the small amount of materialrequired, it is obvious that the cost of producing my temperaturecompensator is reduced to the minimum.

Such modifications may be made as lies within the scope of the appendedclaims, and having thus described my invention, what I claim as new, anddesire to secure by Letters Patent is;

i. In a temperature compensator for clocks, a vu'tical shaft having itsupper end horizontally disposed and vertically slotted l a hole as abearing in said horizontal portion, said shaft having its lower end"izontally disposed and recessed and forated in vertical axial alignment"n the hole through the upper portion reof; a second shaft, having acoefiicicnt of expansion differing from that of the first mentionedshaft 5 the said second shaft being housed within the hole in the upperportion of the first shaft and with its base anchored within and rigidlysecured to the recessed base of the first shaft; said second shafthaving its upper end portion horizontally disposed and inwardly slottedand arranged immediately above the corresponding parts of the firstshaft, as a pendulum support.

2. In a temperature compensator for clocks, a vertical shaft having itsupper end horizontally disposed and vertically slotted and a hole as abearing in said horizontal portion, said shaft having its lower endhorizontallydisposed and recessed and perforated in vertical axialalignment with the hole through the upper portion thereof; a secondshaft housed in the bearing of the first shaft and anchored to therecessed base thereof, said second shaft having its upper end portionhorizontally disposed and inwardly slotted and arranged directly abovethe corresponding parts of the first shaft; a feather spring attached atthe slotted end of the second shaft and arranged within the slottedguide of the first shaft, a pendulum rod and pendulum depending fromsaid feather spring; the coefficient of expansion of the second shaftdiffering from that of the first shaft, feather spring and pendulum rodas indicated.

3. In combination as a temperature compensator for clocks; a movementplate; a vertical shaft having its upper end horizontally disposed andvertically slotted and a hole as a bearing in said horizontal portion;means for attachment of the vertical rod to the movement plate adjacentthe upper vertical horizontal portion of said shaft and so that thelower and major portion of the said shalt depends therefrom free fromthe movement plate and with its lower extremity horizontally disposed asa recessed perforated base element in vertical axial alignment with thehole bearin in the upper horizontal portion; a second 5 iaft arranged inthe hole hearing of the first shaft and with its base anchored withinthe recessed base of the first shaft, said second shaft having its upperend portion horizontally disposed and inwardly slotted and arrangeddirectly above the corresponding parts of the first shaft; a featherspring attached at the slotted end portion of the second shaft andguidingly arranged within the slotted end portion of the first shaft, apendulum rod and a pendulum depending from said feather spring; thecoefficient of expansion of the second shaft differing from that of thefirst shaft, feather spring and pendulum rod, as indicated.

RICHARD A. WOODWARD.

